Use ctypes instead of PyOpenGL for QtWebEngine Nvidia workaround

Fixes #2821

CHANGELOG.asciidoc

@@ -28,6 +28,8 @@ Breaking changes
- New dependency on ruamel.yaml; dropped PyYAML dependency.
- The QtWebEngine backend is now used by default if available.
- New config system which ignores the old config file.
- The depedency on PyOpenGL (when using QtWebEngine) got removed. Note
  that PyQt5.QtOpenGL is still a depdency.

Major changes
~~~~~~~~~~~~~

README.asciidoc

@@ -118,7 +118,6 @@ The following software and libraries are required to run qutebrowser:
* http://jinja.pocoo.org/[jinja2]
* http://pygments.org/[pygments]
* http://pyyaml.org/wiki/PyYAML[PyYAML]
* http://pyopengl.sourceforge.net/[PyOpenGL] when using QtWebEngine

The following libraries are optional:

qutebrowser/browser/webengine/webenginesettings.py

@@ -28,6 +28,9 @@
"""

import os
import sys
import ctypes
import ctypes.util

from PyQt5.QtGui import QFont
from PyQt5.QtWebEngineWidgets import (QWebEngineSettings, QWebEngineProfile,
@@ -199,6 +202,11 @@ def init(args):
    if args.enable_webengine_inspector:
        os.environ['QTWEBENGINE_REMOTE_DEBUGGING'] = str(utils.random_port())

    # WORKAROUND for
    # https://bugs.launchpad.net/ubuntu/+source/python-qt4/+bug/941826
    if sys.platform == 'linux':
        ctypes.CDLL(ctypes.util.find_library("GL"), mode=ctypes.RTLD_GLOBAL)

    _init_profiles()

    # We need to do this here as a WORKAROUND for

qutebrowser/misc/earlyinit.py

@@ -344,12 +344,6 @@ def check_libraries(backend):
        modules['PyQt5.QtWebEngineWidgets'] = _missing_str("QtWebEngine",
                                                           webengine=True)
        modules['PyQt5.QtOpenGL'] = _missing_str("PyQt5.QtOpenGL")
        # Workaround for a black screen with some setups
        # https://github.com/spyder-ide/spyder/issues/3226
        if not os.environ.get('QUTE_NO_OPENGL_WORKAROUND'):
            # Hide "No OpenGL_accelerate module loaded: ..." message
            logging.getLogger('OpenGL.acceleratesupport').propagate = False
            modules['OpenGL.GL'] = _missing_str("PyOpenGL")
    else:
        assert backend == 'webkit'
        modules['PyQt5.QtWebKit'] = _missing_str("PyQt5.QtWebKit")

qutebrowser/utils/version.py

@@ -186,7 +186,6 @@ def _module_versions():
        ('yaml', ['__version__']),
        ('cssutils', ['__version__']),
        ('typing', []),
        ('OpenGL', ['__version__']),
        ('PyQt5.QtWebEngineWidgets', []),
        ('PyQt5.QtWebKitWidgets', []),
    ])

requirements.txt

@@ -7,4 +7,3 @@ MarkupSafe==1.0
Pygments==2.2.0
pyPEG2==2.15.2
PyYAML==3.12
PyOpenGL==3.1.0

tests/unit/utils/test_version.py

@@ -495,7 +495,6 @@ def __init__(self):
            ('yaml', True),
            ('cssutils', True),
            ('typing', True),
            ('OpenGL', True),
            ('PyQt5.QtWebEngineWidgets', True),
            ('PyQt5.QtWebKitWidgets', True),
        ])